Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 251

(6) Dew condensation prevention control for cooling operation
This prevents dew condensation, in the indoor unit, from occurring.
(a) Operating condition: when 52C is kept ON for 30 min, after the unit starts operation.
(b) Operation content: forces the indoor fan to change from Speed 1 to Speed 2.
(c) Reseting condition: When 52C is off, or when dew condensation prevention control has operating continuously for 30
minutes.
(7) Frost prevention for indoor heat exchanger [Preventing frost accumulation on the indoor heat exchanger]
During the Cooling or Dry operation in low room air temp. condition, evaporating temperature will decrease and consequently
indoor heat exchanger sometimes gets clogged with frost (or ice).
In order to prevent this trouble, compressor is stopped by under mentioned condition by indoor heat exchanger thermistor (Th
and timer (built into micro computer circuit) functions.
Also indoor fan is changed over to Lo speed.
Set air
flow
Indoor heat exchanger
temperature (˚C)
(8) Self diagnosis Function
We are constantly to do better service to our custmers by installing such judges that show abnormality of operation as follows.
(a) Abnormality of heat exchanger thermistor: RUN lamp will flashing when the input temperature of the heat exchanger
(b) Abnormality room temperature thermistor: RUN lamp will flashing when the input temperature of the room tempera-
(c) Abnormality of indoor fan motor
CM, FM stoppage condition
O
1
Temperature of heat exchanger is
0˚C or lower.
2 As least 10 minutes has passed
since the compressor started.
thermistor measures less than -20˚C for more than 3 seconds with the
airconditioner "OFF". (will not flashing during operation)
ture thermistor measures less than -20˚C for more than 3 seconds with the
airconditioner "OFF". (will not flashing during operation)
The indoor fan motor revolves at a rate under 300 rpm for 30 seconds or
longer, the RUN lamp will flash.
SCM-C
CM, FM stoppage condition
O
1
Temperature of heat exchanger is
7˚C or lower.
2 As least 3 minutes has passed since
the compressor started.
)
2
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